Otherwise, we get:
    Error: The `brew link` step did not complete successfully
when brew is trying to upgrade Python3 for meson's use upon the
command "brew install meson" in the github runner.

Otherwise github runner for macOS can generate an error attempting to
upgrade Python.

In macOS runner for macOS-13, brew update may be causing it to attempt
to install newer version of Python with meson (newer than the one
installed in the github macOS image), but the new Python install
fails, blocked by the version of Python3 that's already installed.

We avoid doing "brew update" - the brew formulas that are preinstalled
on the github runner image are likely consistent with the
pre-installed software on the image. If we do "brew upate", and then
install something new with brew (specifically meson), and the
"something new" depends on pre-installed software on the image, and
there are new versions of the pre-installed software revealed by doing
"brew update", then when we install the "something new" brew may try
and also install a new version of the pre-installed software on which
the "something new" depends, but that attempt to install a new version
of the pre-installed software can fail as a result of being blocked by
the software that is already installed.

Also, removed this branch from list of branches to run macos.yaml.